{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74657", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.923Z", "datePublished": "2026-08-22T15:32:31.458Z", "dateUpdated": "2026-08-22T15:32:31.458Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-22T15:32:31.458Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: Fix fib_nlmsg_size() for RTA_VIA nexthops\n\nfib_nlmsg_size() still estimates nexthop space as if every gateway is\nencoded as an IPv4 RTA_GATEWAY attribute. IPv4 routes can also carry an\nIPv6 gateway, which fib_nexthop_info() dumps as RTA_VIA.\n\nAs a result, route notifications can allocate an skb that is too small.\nfib_dump_info() then fails with -EMSGSIZE and rtmsg_fib() hits the\nWARN_ON() that marks such failures as a fib_nlmsg_size() bug. With\npanic_on_warn set, this becomes a kernel panic.\n\nMirror the actual nexthop dump layout in fib_nlmsg_size(): account for\nIPv6 nexthop gateways dumped as RTA_VIA, for the no-header rtnexthop\nlayout used inside RTA_MULTIPATH, and for RTA_FLOW only when it is\nactually present."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/fib_semantics.c"], "versions": [{"version": "d15662682db232da77136cd348f4c9df312ca6f9", "lessThan": "0f0ca602941d0a81ae9514943ca06c55159c6385", "status": "affected", "versionType": "git"}, {"version": "d15662682db232da77136cd348f4c9df312ca6f9", "lessThan": "5307a53599fa762c06e475ee4a375252074fd324", "status": "affected", "versionType": "git"}, {"version": "d15662682db232da77136cd348f4c9df312ca6f9", "lessThan": "7f80ad373ce4a7af5367ff273cea0f16e91387f3", "status": "affected", "versionType": "git"}, {"version": "d15662682db232da77136cd348f4c9df312ca6f9", "lessThan": "4a5dfbae5179f6574695012a980476254df2d295", "status": "affected", "versionType": "git"}, {"version": "d15662682db232da77136cd348f4c9df312ca6f9", "lessThan": "a59edda6eda1252340354322d8ab318b2e9052fb", "status": "affected", "versionType": "git"}, {"version": "d15662682db232da77136cd348f4c9df312ca6f9", "lessThan": "9b22f13524fa0de0d963bbd3002df6c28bae3395", "status": "affected", "versionType": "git"}, {"version": "d15662682db232da77136cd348f4c9df312ca6f9", "lessThan": "4ff9548d84945d2cbf9e4c207288063a200ea397", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/fib_semantics.c"], "versions": [{"version": "5.2", "status": "affected"}, {"version": "0", "lessThan": "5.2", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.6.152"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0f0ca602941d0a81ae9514943ca06c55159c6385"}, {"url": "https://git.kernel.org/stable/c/5307a53599fa762c06e475ee4a375252074fd324"}, {"url": "https://git.kernel.org/stable/c/7f80ad373ce4a7af5367ff273cea0f16e91387f3"}, {"url": "https://git.kernel.org/stable/c/4a5dfbae5179f6574695012a980476254df2d295"}, {"url": "https://git.kernel.org/stable/c/a59edda6eda1252340354322d8ab318b2e9052fb"}, {"url": "https://git.kernel.org/stable/c/9b22f13524fa0de0d963bbd3002df6c28bae3395"}, {"url": "https://git.kernel.org/stable/c/4ff9548d84945d2cbf9e4c207288063a200ea397"}], "title": "ipv4: Fix fib_nlmsg_size() for RTA_VIA nexthops", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/fib_semantics.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "0f0ca602941d0a81ae9514943ca06c55159c6385", "status": "affected", "version": "d15662682db232da77136cd348f4c9df312ca6f9", "versionType": "git"}, {"lessThan": "5307a53599fa762c06e475ee4a375252074fd324", "status": "affected", "version": "d15662682db232da77136cd348f4c9df312ca6f9", "versionType": "git"}, {"lessThan": "7f80ad373ce4a7af5367ff273cea0f16e91387f3", "status": "affected", "version": "d15662682db232da77136cd348f4c9df312ca6f9", "versionType": "git"}, {"lessThan": "4a5dfbae5179f6574695012a980476254df2d295", "status": "affected", "version": "d15662682db232da77136cd348f4c9df312ca6f9", "versionType": "git"}, {"lessThan": "a59edda6eda1252340354322d8ab318b2e9052fb", "status": "affected", "version": "d15662682db232da77136cd348f4c9df312ca6f9", "versionType": "git"}, {"lessThan": "9b22f13524fa0de0d963bbd3002df6c28bae3395", "status": "affected", "version": "d15662682db232da77136cd348f4c9df312ca6f9", "versionType": "git"}, {"lessThan": "4ff9548d84945d2cbf9e4c207288063a200ea397", "status": "affected", "version": "d15662682db232da77136cd348f4c9df312ca6f9", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv4/fib_semantics.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.2"}, {"lessThan": "5.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.152", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.104", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: Fix fib_nlmsg_size() for RTA_VIA nexthops\n\nfib_nlmsg_size() still estimates nexthop space as if every gateway is\nencoded as an IPv4 RTA_GATEWAY attribute. IPv4 routes can also carry an\nIPv6 gateway, which fib_nexthop_info() dumps as RTA_VIA.\n\nAs a result, route notifications can allocate an skb that is too small.\nfib_dump_info() then fails with -EMSGSIZE and rtmsg_fib() hits the\nWARN_ON() that marks such failures as a fib_nlmsg_size() bug. With\npanic_on_warn set, this becomes a kernel panic.\n\nMirror the actual nexthop dump layout in fib_nlmsg_size(): account for\nIPv6 nexthop gateways dumped as RTA_VIA, for the no-header rtnexthop\nlayout used inside RTA_MULTIPATH, and for RTA_FLOW only when it is\nactually present."}], "id": "CVE-2026-74657", "lastModified": "2026-08-22T16:16:39.333", "metrics": {}, "published": "2026-08-22T16:16:39.333", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0f0ca602941d0a81ae9514943ca06c55159c6385"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4a5dfbae5179f6574695012a980476254df2d295"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4ff9548d84945d2cbf9e4c207288063a200ea397"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5307a53599fa762c06e475ee4a375252074fd324"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7f80ad373ce4a7af5367ff273cea0f16e91387f3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9b22f13524fa0de0d963bbd3002df6c28bae3395"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a59edda6eda1252340354322d8ab318b2e9052fb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d15662682db232da77136cd348f4c9df312ca6f9,0f0ca602941d0a81ae9514943ca06c55159c6385)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d15662682db232da77136cd348f4c9df312ca6f9,5307a53599fa762c06e475ee4a375252074fd324)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d15662682db232da77136cd348f4c9df312ca6f9,7f80ad373ce4a7af5367ff273cea0f16e91387f3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d15662682db232da77136cd348f4c9df312ca6f9,4a5dfbae5179f6574695012a980476254df2d295)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d15662682db232da77136cd348f4c9df312ca6f9,a59edda6eda1252340354322d8ab318b2e9052fb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d15662682db232da77136cd348f4c9df312ca6f9,9b22f13524fa0de0d963bb3002df6c28bae3395)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d15662682db232da77136cd348f4c9df312ca6f9,4ff9548d84945d2cbf9e4c207288063a200ea397)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.216,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.183,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.152,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T18:00:04.733473+00:00", "updated": "2026-08-22T22:15:16.733738+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}